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Police and the FBI are also investigating whether he planned a car bombing.

The chilling revelations came as new detail emerged yesterday about Paddock's lifestyle.

A former worker at the Atlantis Casino Resort and Spa in Reno, Nevada, where Las Vegas shooter Paddock frequently gambled, said he had a "god complex" and expected quick service no matter how busy employees were.

"It was just his demeanour. It was like, 'I'm here. Don't cross me. Don't look at me too long'," said former executive host John Weinreich.

Another gambler described him as "creepy".

It was here that Paddock met his Australian partner Ms Danley, 62, who has been described as "a person of interest" by investigators.

Ms Danley previously worked as a high roller hostess at the casino which is about a 20 minute drive from the Reno home they shared and were both last seen at in August.

They had another home in Mesquite, an hour northeast of Las Vegas. Both have been raided by police who found weapons and explosives.

Ms Danley was questioned in Los Angeles on Wednesday by the FBI and is understood to be staying in the city with her daughter, who lives in Venice Beach. Sheila Darcy Linton, 40, is an artist with a 7-year-old son.

The family home has been empty since media camped on their street from Monday, according to neighbours, who described Ms Linton and her husband Micah Linton as "just a normal family".

A makeshift memorial has been set up under the Welcome to Faboulous Las Vegas sign in the shadow of Mandalay Bay hotel. Photo / AP

"He'd come in on and off, sometimes up to three times a week," David Blake, 81, told the site.

"He's been coming in at least a year and when I first saw him I thought he was a homeless person, he was unshaven, dishevelled, quiet - he wasn't a big conversationalist," he said.

Blake added that Paddock's odd behaviour was not unusual in the gambling town.

"A lot of people who heavily gamble are like that, they're in a world of their own," he said. "They don't get a chance to have much of a social life. Stephen didn't seem to me like he was in to anything else other than deep thinking of how he was going to play his next poker game."